Harry, who was 16 and from Haringey, was fatally stabbed on Primrose Hill as crowds gathered to watch fireworks.
The defendant, who cannot be named due to his age, was charged with Harry’s murder six days after his death.
In September last year the defendant faced a murder trial at the Old Bailey but the jury was discharged in October.
A retrial will now take place in October this year.
Alex Rosen, head of St Thomas More Catholic School in Wood Green, said that the school had lost a “promising young soul”.
In a statement posted to the school’s website, he added: “Harry touched the lives of many with his infectious laughter and enthusiasm for life.
“He will be remembered for his many qualities, particularly his resilience and the positive impact he had on those around him.”
Harry had also attended Wilbury Primary School in Tottenham.
Lisa Wise, headteacher of the school in Wilbury Way, said she was “devastated” to hear of the tragic loss of the former pupil.
She said: “Harry was a much loved boy; always smiling, always happy and surrounded by a loving family and friends.”
